Amgen Shares Fall 10% Tuesday to $394 on Lp(a)-Class Fears After Novartis Pelacarsen Phase 3 Miss; Olpasiran Readthrough in Focus
Amgen (NASDAQ: AMGN) shares fell approximately 10% to $394.38 by midday Tuesday September 8, 2026 as investors continued to reprice the entire Lp(a)-lowering cardiovascular hypothesis following Novartis' Friday September 4 announcement that pelacarsen missed the primary MACE endpoint in the Phase 3 Lp(a)HORIZON trial. Amgen's olpasiran (RNAi Lp(a) suppressor) is the most direct readthrough: the Phase 3 OCEAN(a) trial is enrolling patients with elevated Lp(a) and established cardiovascular disease with a similar Lp(a)-lowering-plus-cardiovascular-outcome design and is estimated to read out 2027-2028. Lilly's lepodisiran (RNAi) is running in a broader group including primary-prevention patients, which analyst commentary suggests partly insulates it from the Novartis-specific readthrough. Silence Therapeutics' zerlasiran (RNAi) lowered Lp(a) by up to 85% at 36 weeks in ALPACAR-360; Silence has FDA feedback on a proposed Phase 3 design but is dependent on securing a development partner. The Lp(a) hypothesis question is now whether the drug class lowers hard cardiovascular outcomes, not whether the class lowers Lp(a) levels — that latter question was already answered in the affirmative.